Sad Mac

So my iMac (a 17” G4/1.25GHz
model) died last week.
When I turn it on, the backlight comes on, it makes the Apple sound, but
nothing happens video wise, either on the built in screen or the
external monitor port. Does anyone have any suggestions on ways to save
it without spending a bundle? If it can’t be saved, any suggestions on a
cheap replacement? I need to build ccPublisher for OS X, among other things.